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ASTM F 1649 : 2020

Current

Current

The latest, up-to-date edition.

Standard Test Methods for Evaluating Wet Braking Traction Performance of Passenger Car Tires on Vehicles Equipped with Anti-Lock Braking Systems

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

01-10-2020

€61.92
Excluding VAT

Committee
F 09
DocumentType
Test Method
Pages
13
PublisherName
American Society for Testing and Materials
Status
Current
Supersedes

1.1These test methods cover the measurement of two types of ABS vehicle behavior that reflect differences in tire wet traction performance when the vehicle is fitted with a series of different tire sets to be evaluated.

1.1.1The stopping distance from some selected speed at which the brakes are applied.

1.1.2The lack of control of the vehicle during the braking maneuver. Uncontrollability occurs when the vehicle does not follow the intended trajectory during the period of brake application despite a conscious effort on the part of a skilled driver to maintain trajectory control. Uncontrollability is measured by a series of parameters related to this deviation from the intended trajectory and the motions that the vehicle makes during the stopping maneuver.

1.1.3Although anti-lock braking systems maintain wheel rotation and allow for a high degree of trajectory control, different sets of tires with variations in construction, tread pattern, and tread compound may influence the degree of trajectory control in addition to stopping distance. Thus vehicle uncontrollability is an important evaluation parameter for tire wet traction performance.

1.2These test methods specify that the wet braking traction tests be conducted on two specially prepared test courses: (1) a straight-line (rectilinear) “split-µ” (µ = friction coefficient) test course, with two test lanes deployed along the test course (as traveled by the test vehicle); the two lanes have substantially different friction levels such that the left pair of wheels travels on one surface while the right pair of wheels travels on the other surface; and (2) a curved trajectory constant path radius course with uniform pavement for both wheel lanes.

1.3As with all traction testing where vehicle uncontrollability is a likely outcome, sufficient precautions shall be taken to protect the driver, the vehicle, and the test site facilities from damage due to vehicle traction breakaway during testing. Standard precautions are roll-bars, secure mounting of all internal instrumentation, driver helmet, and secure seat belt harness, etc.

1.4The values stated in SI units are to be regarded as the standard. The values given in parenthesis are for information only.

1.5This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM F 1572 : 2008 : R2015 Standard Test Methods for Tire Performance Testing on Snow and Ice Surfaces
ASTM F 538 : 2024 Standard Terminology Relating to Characteristics and Performance of Tires
ASTM F 1046 : 2001 : R2015 Standard Guide for Preparing Artificially Worn Passenger and Light Truck Tires for Testing
ASTM F 2493 : 2024 Standard Specification for P225/60R16 97S Radial Standard Reference Test Tire
ASTM E 965 : 2015 : R2024 Standard Test Method for Measuring Pavement Macrotexture Depth Using a Volumetric Technique
ASTM F 1806 : 1997 Standard Practice for Tire Testing Operations—Basic Concepts and Terminology for Reference Tire Use
ASTM F 1805 : 2020 Standard Test Method for Single Wheel Driving Traction in a Straight Line on Snow- and Ice-Covered Surfaces
ASTM F 538 : 2013 Standard Terminology Relating to the Characteristics and Performance of Tires
ASTM F 457 : 2004 : R2024 Standard Test Method for Speed and Distance Calibration of Fifth Wheel Equipped With Either Analog or Digital Instrumentation
ASTM E 1337 : 1990 Standard Test Method for Determining Longitudinal Peak Braking Coefficient of Paved Surfaces Using a Standard Reference Test Tire
ASTM E 303 : 2022 Standard Test Method for Measuring Surface Frictional Properties Using the British Pendulum Tester
ASTM F 1572 : 2021 Standard Test Methods for Tire Performance Testing on Snow and Ice Surfaces
ASTM F 1650 : 1998 : R2014 : EDT 1 Standard Practice for Evaluating Tire Traction Performance Data Under Varying Test Conditions
ASTM E 1337 : 2019 Standard Test Method for Determining Longitudinal Peak Braking Coefficient (PBC) of Paved Surfaces Using Standard Reference Test Tire
ASTM F 538 : 2022 Standard Terminology Relating to Characteristics and Performance of Tires
ASTM E 965 : 2015 : R2019 Standard Test Method for Measuring Pavement Macrotexture Depth Using a Volumetric Technique
ASTM F 538 : 2021 Standard Terminology Relating to Characteristics and Performance of Tires
ASTM F 457 : 2004 : R2017 Standard Test Method for Speed and Distance Calibration of Fifth Wheel Equipped With Either Analog or Digital Instrumentation
ASTM F 1650 : 2021 Standard Practice for Evaluating Tire Traction Performance Data Under Varying Test Conditions
ASTM E 303 : 1993 : R2018 Standard Test Method for Measuring Surface Frictional Properties Using the British Pendulum Tester
ASTM F 1806 : 2014 Standard Practice for Tire Testing Operations–Basic Concepts and Terminology for Reference Tire Use
ASTM F 1806 : 2021 Standard Practice for Tire Testing Operations–Basic Concepts and Terminology for Reference Tire Use
ASTM F 1046 : 2021 Standard Guide for Preparing Artificially Worn Passenger and Light Truck Tires for Testing

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